The cause of fever is usually an infection of some kind. This could include:
Diseases caused by viruses
Such as colds, flu, COVID-19 or other upper respiratory infections.
Diseases caused by bacteria
Such as tonsillitis, pneumonia or urinary tract infections.
Chronic illnesses
Such as rheumatoid arthritis and ulcerative colitis can cause fevers that last for longer.
Tropical diseases
Such as malaria, which can cause bouts of recurring fever.
Heat stroke
Can cause fever without sweating.
Drugs or medication
Some people may experience fever as a side effect of drugs or medication.
Signs of fever
Fever is a symptom and not an illness. Signs of fever can include:
- Feeling unwell
- Muscle ache
- Feeling hot and sweaty
- Shivering or shaking
- Chattering teeth
- Flushed face
